Select Language. Message Regarding Your Privacy. I accept Submit Submit. Please note that RTV is not to be used on the entire gasket; the gasket should be installed clean and dry. Using a small amount of RTV will fill in those areas to assure a leak-free assembly. RTV is typically applied to the corner s or stepped areas on the engine so as not to smear the RTV during the installation of the component. Intake End Seals. Where the side rail gaskets will meet the intake end seals see images below.
Once the intake end seals are installed, another small dab is recommended where the end seals meet the side rail gaskets To form the complete intake end seals, some engines just use RTV as their end seals see image below. Timing Cover Gaskets. Oil Pan Gaskets. Where the RMB journal and timing cover journal meet the oil pan side rails T-joint Stepped areas such as the front cover joint or RMB retainer to block joint T-joint see image below. Valve Cover Gaskets.
Stepped areas such as cylinder head to intake manifold joints see image below. Applying too much product can cause excess sealant to squeeze out and migrate into areas where it might cause trouble — such as clogging the screen of the oil pickup. Try to apply the gasket maker or flange sealant in one continuous and even bead to one surface.
Ensure all bolt holes are circled. A thin bead will spread out and cover the assembly properly. Excess gasket maker can cause it to squeeze out. Using an RTV or anaerobic gasket maker on an application that is exposed to gasoline. Only solvent-based gasket makers have the ability to stand up to repeated direct contact to gasoline. Powersports vehicles, antique cars, gas-powered tools, and equipment all tend to have their gaskets exposed to gasoline.
Gas weakens RTV and anaerobic flange sealants. If your assembly will have direct exposure to gasoline, you should use a solvent-based gasket maker. Not allowing the full cure time before returning to service. All gasket makers and flange sealants need some time to cure before the assembly can be put back into service.
Failure to wait the correct amount of time can compromise the integrity of your seal. Anaerobic flange sealants and gasket makers need about an hour to cure. Solvent-based flange sealants need to air-dry before they can be reassembled, and then they need another 10 minutes to dry before re-checking torque. Trying to fill a large gap with an anaerobic gasket maker. Anaerobic gasket makers and flange sealants are designed for sealing assemblies where two close fitting machined metal surfaces come together.
Waiting for the gasket maker to partially dry before reassembling. It is fine to use the correct RTV sealant instead of a gasket if used in the right application oil, high temp, fuel. Not, however, if the gasket thickness is required to produce a specific amount of clearance. RTV sealant is better than primitive gaskets in most applications ie.
Water pumps, thermostat housings, intake manifolds, sump pans. It depends on what gasket you are choosing to replace, and on what engine, but for some small number of gaskets on some engines, it is possible, yes.
However, you should almost never do that, and should always use the gasket. Here is what Permatex, a leading manufacturer of RTV silicone, says about their high-temp. It replaces almost any cut gasket by making reliable 'formed-in-place' gaskets that resist cracking, shrinking and migrating caused by thermal cycling.
Coats pre-cut gaskets to increase reliability. Resists auto and shop fluids, with a temperature range of degrees fahrenheit to degrees fahrenheit intermittent. A first generation gasket maker, it is OEM specified. Permatex offers significant performance advantages which include outstanding oil resistance, excellent torque retention and hi-temp, sensor-safe properties.
Extended warranties, engine sensors and new component materials such as aluminum, bi-metal alloys and high-tech plastics, have created the need for superior RTV silicone gasket makers in both OEM production and service applications.
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